Re: Public Service Announcement: Spark Plug Wires

| Assuming that the air gap is a 1mm cube, that's 20,000,000,000 ohms.
Not when sparks jump across this gap.  Per "Electrical Technology" 6th
edition paragraph 5.28, composed by Edward Hughes ( fellow of Heriot
-Watt University, Edinburgh, Scotland ) revised by Ian McKenzie Smith
( head of dept of electrical engineering, Stow College, Glasgow ),
published by ELBS ( Longman, UK ) in 1987 : -
"If the p.d. between the opposite sides of a sheet of solid insulating
material is increased beyond a certain value, the material breaks down.
Usually this results in a tiny hole or puncture through the dielectric so
that the latter is then useless as an insulator."  In this paragraph's table,
ordinary air of 1mm gap breaks down @ just 4.46 kv.

| We are not talking about a DC where you can plug in Ohms law
Voltage division applies identically over resistance / reactance loads,
in DC / AC circuits, see above book's example # 8.5 .

| 25kOhm is of no significance compared to the
| resistance of the 1mm spark plug air gap.
When air is compressed by 9.6, & is hot, resistance must be just a
fraction of original amount. Nevertheless, hardly any resistance exists
when a dielectric breaks down.

| The resistance built into the
| spark plug wire is their to slow the slew rate of the spark delivery as a
| means to limit electro-magnetic induction noises
www.magnecor.com/magnecor1/truth.htm